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AUTOCHTHONOUS VACCINIUM MYRTILLUS L. - ANTIOXIDANT ACTIVITY, KINETICS AND CYCLODEXTRIN NANOENCAPSULATION OF THE HYDROPHILIC EXTRACTS
Abstract
Vaccinium myrtillus L. (European blueberry) hydrophilic extracts (Vm) are valuable raw ingredients for food, cosmetic and pharmaceutical applications. The high content of antioxidant compounds in blueberry can be exploited for obtaining more stable biomaterials. The goal of the study was the evaluation of the antioxidant activity (DPPH-, 2,2-diphenyl-1-pycryl-hydrazyl) of autochthonous blueberry (C-mpeni, Romania) and stabilizing of the Vm by nanoencapsulation in cyclodextrins (CD). Kinetic parameters were also evaluated. The antioxidant activity of the 1:100 diluted extracts were in the range of 68.7-94.8%, with a slow release up to 15 min (and further). In the case if -fast- and -slow- reaction types, the best kinetic results were obtained for the 1st-order reactions (rate constants of 0.009-0.021 1/s and 0.0022-0.0045 1/s, respectively). a- and --CD complexation yields were similar (41.1-3.5 and 40.4-2.6%) and FTIR revealed the presence of the main antioxidant compounds in the micro and nanoparticles. The CD:Vm nanoparticles were clearly discriminated from starting materials by PCA. This study demonstrates the valorisation of autochthonous blueberry by CD nanoencapsulation for food, cosmetic and pharmaceutical products due to their important antioxidant capacity, modulated by CDs.
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